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You have a door sensor problem. The IR sensors found at the bottom of the door rails will need some attention. Both have an LED visible. Is one on or none? If none are on, check the wiring. Older models had a plug in the rear of the sensor that corroded due to moisture, causing intermittent or no operation. If 1 is on, check to be sure that they are aligned with each other. If they are crooked, the door will not close without holding the wall button (as you described). They are easily knocked out of alignment. Check for cobwebs and debris blocking the sensors. Replacement sensors are around $50 and are easily installed with just wire cutters and pliers. Remember to unplug the unit before replacing the sensors.
Check your door sensors. They must be pointed directly at one another and the small light on each one must be lit and not flickering. If by tweaking them you can't get both lights to come on you may have a wiring problem or one of the sensors has quit working.
It sounds like there might be a loose wire connection on the inside of the sensor. You could also be moving the position of the sensor slightly into alignment when you squeeze the sensor. You will need to disconnect the wires for the sensor on the garage door opener or disconnect the power. Then use a flatblade screw driver and carefully seperate the sensor case. Check for any loose connections on the wiring(you might need to re-solder the wire to the sensor eye). It sounds like a loose wire connection to me.
It sounds like you have a problem with your wall button. I would remove the button from the wall and then disconnect the 2 wires on the back. Remember where they go as they are color coded. You can then momentarily touch the two wires together to check the operation. There isn't enough voltage there to bother you.
One thing to remember. If when the door reverses the main light flashes 10 times it is a door sensor problem and nothing else.
For some reason, the bulbs I tested that worked somehow didn't work correctly when inserted into the door opener. We opened another set of bulbs we purchased and what do you know, the light now works. I don't fully understand as the other bulbs did work just not in the garage door opener.
YOU PROBABLY HAVE A BROKEN WIRE ON THE SENDING EYE. THIS WOULD CAUSE IT NOT TO LIGHT AND THE RECIEVER NOT TO GET A SIGNAL MAKING IT NOT LIGHT.
YOUR DOG IS PROBABLY THE CULPRIT AGAIN . THEY TEND TO SNIFF AROUND OR JUST GENERALLY BUMP INTO THE WIRES (SOMETIMES THEY CHEW THEM).
IF NO OBVIOUS BROKEN WIRES OR LOOSE CONNECTIONS CAN BE FOUND. YOU CAN TEST THE WIRING BY USING DOOR BELL WIRE TO TEMPORARILY REPLACE IT - THE FAULT COULD BE INSIDE THE WALL OR UNDER A STAPLE WHERE THE WIRES GET SMASHED (THIS ONE WE CAN'T BLAME ON THE DOG) :)
IF YOU REWIRE COMPLETELY (PAY ATTENTION TO THE POLARITY OR THE TEST WILL NOT BE VALID) AND THE LEDS STILL ARE NOT ON YOU COULD HAVE A DEFECTIVE EYE
That normally happens when the sensors aren't aligned. Both sensors have led lights on them the yellow/orange one will stay on all the time the green one will go out if it cant see the other sensor. Possibly theres a wire that's broken or the other sensor is really out of alignment. Check every inch of wiring from the sensor to the opener, remove wire nuts if present and check the connections. The wires that are used are small, solid and can break easily. Also see if there's a staple that's too tight, move the wire abit where it's stapled and look for damage.